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Check valve selection and installation
Check valve, also known as one-way valve or check valve, its role is to prevent pipeline backflow of media. The end of the pump suction valve also belongs to the check valve category. Opening and closing parts by the media flow and strength to open or close their own to prevent media backflow valve called the check valve. Check valves are automatic valves, mainly used for medium flow of one-way pipe, only allow medium to flow in one direction to prevent accidents. First, the check valve selection: 1, check valve is generally suitable for cleaning media, should not be used for containing solid particles and larger viscosity media. 2, for the following DN50mm low-pressure check valve, should use the butterfly check valve, vertical lifting check valve and diaphragm check valve; DN greater than 200mm, less than 1200mm in the low-pressure check valve, should use no wear and tear Spherical valve; For DN greater than 50mm, less than 2000mm low-pressure check valve, butterfly check valve and diaphragm check valve should be used. 3, the diaphragm check valve is suitable for easy to produce water on the pipeline, the diaphragm can be very good to eliminate the water generated when the media counter-current, but by the temperature and pressure limits, generally used in low pressure room temperature pipe 4, The impact of smaller or anhydrous pipe, should use the slow closing Swing Check Valve and slow closing butterfly check valve. Second, the check valve construction, installation 1, the installation position, height, direction of import and export must meet the design requirements, pay attention to the direction of the flow of media should be consistent with the direction of the arrow marked body, the connection should be firmly 2, the valve must be installed before Appearance inspection, the valve nameplate should be consistent with the current national standard "General Valve Flags" GB 12220 requirements. For the working pressure is greater than 1.0 MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with the requirements of GB 50243. 3, do not make the check valve in the pipeline to bear the weight, large-scale non-return valve should be independent support, so that the impact of pressure from the pipe system. Third, the check valve installation Notes Top: 1, do not make the check valve in the pipeline to bear the weight of large check valve should be independent support, so that the impact of the pressure from the pipe system. 2, when installing, pay attention to the direction of the flow of the medium should be consistent with the arrow direction of the body ticket. 3, vertical drop-check valve should be installed in the vertical pipe. 4, lift-level flap check valve should be installed on the level of the pipeline. This article Keywords: check valve